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This premise was done before but anyway here's my take on it.

Night Watchman

Booth rolled over in his sleep, his arm reaching for his brand new girlfriend. The past two months had been somewhat like a dream and there were times when he still had trouble believing this was his new reality. He finally had gotten what he wanted, a relationship with his long-time partner. She seemed to have settled into it much easier than he had anticipated. But a couple of nights ago, their new normal was changed again. Bones is pregnant, with my baby! The though made Booth smile. This was better than icing on the cake.

He peeked an eye open, then two when he realised that she was not beside him. Blinking back deep sleep, Booth sat up and glanced round her bedroom.

"Bones?" He called out into the silence of the night. The only reply he got was the silence of the night. He threw off the covers, making his way to the bathroom, wondering if the infamous morning sickness had started. She wasn't there. A quick round of her apartment confirmed what he had suspected. She wasn't home. Sighing, Booth sat on the couch, rubbing his face. He glanced at the clock. It was three forty in the morning.

He knew she had a process and this was her way of dealing with their new relationship and parenthood. When they had just got together after Vincent's death, Booth learned that she sometimes disappeared in the middle of the night. If he was lucky, she would return around dawn to have breakfast with him before they headed to work. If she lost track of time, he would find her hunched over some old bones in the bone room.

They had argued over it initially and he had made trips to the lab to bring her home, but then their relationship was so new that Booth figured he had to let it go. She was still getting used to the fact that they were a couple and he knew that these little excursions to the lab in the dead of night was her way of exerting her own independence and at the same time processing their new relationship. Afterall, they spent almost every waking and sleeping hour together. The only time they did not spend nights together was when Booth had Parker over. Their relationship was so new, it was still secret, for the simple fact that what was theirs should only be theirs alone for now.

With her pregnant, he knew that they would have to start telling friends and family soon, but they still had a little time. This secret was fun to keep. Her trips to the lab at night grew less frequent as she grew used to being in a relationship with him, but then she got pregnant. It wasn't intended, but he couldn't be happier. She seemed happy about it too, but he noticed she tossed and turned more lately. Her little trips to the lab started again.

Drowsy from his own musings, Booth soon fell asleep on the couch. He was woken, what seemed like a minute later, by the sound of the apartment door opening.

"Booth? Why are you sleeping on the couch?"

"Woke up and you weren't there." Booth replied sitting up. The first vestiges of sunrise were starting to creep into her apartment.

"You know I was at the lab."

Booth sighed. "I know but still…" he shrugged trying to look nonchalant when inside he was worrying.

"Are you being over-protective because I'm carrying your progeny?" She asked as she shrugged off her coat and joined him on the couch.

"It's our baby, Bones. Sound better when you don't science it up like that."

"Fine, carrying our fetus."

Booth chuckled. Compromise. He reached for her hand, pulling her to him for a passionate kiss. He loved that he could now do that, in the privacy of their homes.

"I'm rather famished. Are you making breakfast?" She asked after they broke the kiss, slightly out of breath.

"Sure, what do you want? Anything for the mother of my baby." Booth stood smiling.

"An omelette."

"With tomatoes and cheese right?"

"Yes, and broccoli." She smiled and his heart melted. That smile was now his and his alone.

Booth made his way to her kitchen, quickly gathering what was need to make breakfast for them. Even before they were a couple he had cooked for her in her apartment numerous times and he knew where everything was. She joined him at the kitchen counter, pouring herself a glass of milk and getting ready to make coffee for him. It was simple actions like this that made him want to pinch himself. It felt so domestic.

"So um Bones, we don't have a case right now, you don't have to go to the lab in the middle of the night you know?"

"I know. But I had trouble sleeping. I've explained it to you before Booth, sometimes it helps me think, put things into perspective, especially since I'm pregnant."

"Yeah, I mean you're okay with it right?"

"Yes I've assured you numerous times, this pregnancy though unplanned is not an unpleasant surprise. I'm looking forward to raising a child with you."

Booth started chopping up a tomato. "Yeah but you know if you need some time alone or whatever, you could just tell me. I'll just go home. You can take all the time you need."

"I enjoy your company Booth, and what you're proposing, it's not the same. I need to go to the lab, work with bones… it's what is needed.

"To think about stuff."

"Yes."

"Look, you're gonna get mad but I gotta say it and it's not because of some alpha-male, anthropological whatever but I kinda get worried when you disappear in the middle of the night like that you know? I mean it's late, no one would see you going out or comin' back, the lab's probably empty and you're pregnant. You need your rest and you gotta eat."

"I am eating. My weight gain is within healthy limits for the first trimester, and I am safe. I'm not alone in the lab."

"Human remains don't count Bones." Booth said as he cracked two eggs into the mixing bowl.

"I was referring to Micah."

The name rang a bell, but he couldn't quite remember where he had heard the name before. "Who's Micah again?"

"The night watchman. I've known him for nine years, he's rather good company and he's rather well informed. He attends many of the lectures the Jeffersonian conducts hence conversing with him is rather enjoyable at times. Sometimes, he brings me snacks too."

"He does huh? He's not some creepy guy, trying to get into your pants or something is he?" Her explanation wasn't assuring him one bit.

"Get into my pants meaning have intercourse with me?"

"Yeah."

Brennan frowned. "That's preposterous Booth! It's nothing like that. You're just jealous."

"So what if I am huh? You're my girlfriend right?"

"Booth!" She stared at him, irate.

"Right fine, I'm sorry." He didn't want to upset her anymore than he already did.

"I already told you before. I am committed to a serious, monogamous relationship with you."

Booth couldn't help but smile. "I love you too Bones." She had yet to say the words back to him, but he knew she loved him.

"There's no need to worry Booth, Micah is good company and I am safe in the lab."

Booth wanted to argue, but their cellphones rang almost simultaneously. They had a case. As they hurried to prepare to go to the crime scene Booth made a metal note to check up on this night watchman.

Later at the crime scene, while Brennan was busy examining the set of horribly mangled remains, Booth approached Cam.

"Camille I need a favor."

"What is it Seeley?"

"You know the night watchman at the lab?"

"Which one?"

"Guy named Micah."

"Okay? Why the sudden interest? He owe you money or something?" Cam asked amused.

Since his relationship with Brennan was still a secret, Booth could not tell Cam the truth. "Yeah something like that. You know his last name?"

Cam regarded him for a moment. "Are you gambling again?"

"No, no. I promise."

"I don't recall a Micah."

"Really?"

"We have a few night watchmen who rotate shifts."

"Look just do me a favor okay? When you get back to the office, see if you can find me his last name? He's been there at least nine years."

"Why the sudden interest in this guy?"

"Personal favor Camille."

Cam paused.

"I'm not in trouble and I'm not gambling. Trust me."

"I'll see what I can do."

"There's no night watchman named Micah." Cam told Booth over the phone later that afternoon.

"What?! Maybe you missed his name or something?"

"I'm serious Seeley, there is no night watchman with that name."

Booth sighed loudly into the phone. He wondered if Brennan had made this person up or worse, she was hallucinating.

"Is this about Dr Brennan?" Cam asked, knowing how her long-time friend only got like that when it came to two people in the world, Parker and Brennan.

"What? No…" Booth had intended to run a background check on Micah. From the way things were going, it looked like he had to go with his plan B. "Thanks for helping and don't tell Bones about this okay?"

"So this is about Dr Brennan."

"Cam I gotta go."

Booth hung up before Cam had a chance to reply.

That night, Booth woke to find himself alone again. He sat up, it was time to put his plan into action. He got dressed and drove to the lab. He knew Brennan would be angry but he would risk it. The safety of his girlfriend and unborn child were at stake. When he arrived at the lab, it was deathly silent.

The light in the bone room was on so he knew Brennan had to be there. He strode in, expecting to see her hunched over the bones of the latest victim in their case. The bones were neatly arranged on the light table but Brennan was no where to be found. Feeling a little panicked, Booth decided to try her office.

"Can I help you?"

The man's voice made him turn. A short, balding man in a security guard uniform was regarding him with curiosity.

"I'm lookin' for Dr Brennan."

"Oh you must be Agent Booth." The man smiled. "She's talks about you. I'm Micah the night watchman."

"Micah right." At least he wasn't a figment of Brennan's imagination.

"I saw her heading to the women's room. She should be back soon."

"Right, thanks." Booth's gut detected no malice in the kindly looking man. His smile and open gestures told Booth he had nothing to hide.

"You know I keep telling her to go home, but she doesn't always listen. It's not healthy, the body needs it's sleep, brain needs to recharge."

Booth quirked an eyebrow. He almost sounded like the male version of Brennan.

Micah grinned rather sheepishly, "I heard that in a lecture."

"Yeah Bones told me."

"Bones." Micah laughed. "She told me you called her that."

"Anything else she tell you?"

"Nothing much. All I know is that you mean a lot to her."

"Thanks for keeping an eye on her, bringing her things to eat."

"It gets boring making rounds here at night. She's good company."

It was the first time Booth had heard someone else other than Angela say that. "That she is."

"Micah right? So um I was wondering why Dr Saroyan couldn't find you on file? I'm just curious. It's my job…"

"Oh that, yeah Micah's the name my mother gave me. When we moved here from Poland after the war, I was just a baby, my parents changed my name."

"The war like…"

"Yeah Germans, Nazis, things like that."

"Wow."

"Yeah."

"Booth!" Brennan's voice interrupted their conversation. "Why are you here?"

Before Booth could answer Micah spoke, "It's getting late Dr Brennan. Or should I say early? Agent Booth just wanted to give you a ride home."

"Yeah Bones. The case can wait. You need your rest, brain needs sleep to recharge." Booth held his breath, hoping she wouldn't be angry. He flashed her his charm smile. "C'mon Bones, let's go home huh?"

Booth breathed a sigh of relief when Brennan nodded. "Okay, I find I am getting tired."

Not caring if Micah knew, Booth reached out and took her hand, leading her out of the lab.

"Goodnight Dr Brennan." Micah called after them as the couple left the lab.

"I know you came to check on me." Brennan said as she climbed into his SUV.

"I did. I know you're mad, but it's my job to look out for you and our baby. I'm not going anywhere, I love you. If anything happened to you or the baby…" Booth paused, the thought of losing all he held dear too unbearable to try imagine.

To his surprise, Brennan leaned over to kiss him on the cheek. "I should be angry, but strangely I'm not. I fell rather happy, safe."

Booth grinned slowly but surely she was changing. "Great, now let's get you home."