Maggie's apartment was quiet as Alex crept through the unfamiliar space.

"Kara?" she whispered into the darkness.

She fumbled with her phone and squinted against the harsh light from the screen. Supergirl's tracker was still showing at the apartment building.

"Kara?" Alex whispered again.

Receiving no response, Alex continued to Maggie's bedroom and peered through the door.

Maggie was right where she had left her a couple of hours ago, curled up on the right side of the bed, facing away from the door. Supergirl was cuddled next to her, lying on top of the bed sheets, her red cape covering Maggie completely.

Alex stood frozen, clutching the door handle as she tried to comprehend the situation. Both women were breathing gently, clearly sound asleep and so Alex sighed and shut the door gently. She made her way to Maggie's living area. It was freezing, Kara hadn't shut Maggie's window on her way in. Alex struggled through the pain in her ribs to pull the window shut and then eased herself down on the couch. She sent a quick text to Eliza to let her know that she had found Kara and then relaxed back onto the couch, allowing herself to doze and then finally fall asleep properly for the first time in days.

Alex woke up to screaming. Loud and high-pitched, the kind of screaming that would result in even the most negligent of neighbours calling the police.

Alex nearly wrenched the bedroom door off its hinges in her attempt to get through and find out what the hell was going on. Maggie was still curled up under her covers with Supergirl's cape covering her, seemingly deaf to the noise coming from Kara next to her.

Kara herself didn't appear to have moved either.

Risking further injury, Alex decided that she had to wake Kara up, if only to prevent the NCPD barrelling through the apartment, guns drawn, ready to protect one of their own.

"Kara?" she called over the screams from the foot of the bed.

"Kara, everything is okay."

Kara shook her head violently, blonde hair flying everywhere, but she didn't stop wailing.

"You're only dreaming," Alex tried to sooth.

"Kara, you'll wake Maggie up," Alex chanced gently stroking Kara's arm.

Kara fell silent and adjusted her arm so that it was across Maggie but didn't open her eyes.

Alex sighed as Kara began to mumble incomprehensibly.

She had seen Kara like this before. When she first arrived on the planet she would have nightmares, screaming in her sleep was an almost daily occurrence for the first month. As Kara had settled on Earth, the night-time terrors had become few and far between, only really occurring after a particularly stressful day or on an important date. Once they had really become sisters, Kara would seek Alex out for comfort on these rare occasions, clinging to her in her sleep. Alex had never been able to sleep through Kara's middle of the night visits though, unlike Maggie now.

Alex slowly made her way to Maggie and gently placed two fingers to her neck. Maggie's pulse was slow but strong.

"Maggie?" she tried half-heartedly, she didn't really expect Maggie to wake up after the screaming she had just slept through.

Unsurprisingly, Maggie didn't stir and Alex felt her heart sink as memories of lying next to Maggie flashed through her mind. Maggie had always been a light sleeper, just like Alex she couldn't turn off the cop part of her brain. Both Maggie and Kara were still clearly under the residual effect of the alien's sedative, even though Eliza and Alex had been unable to detect anything in their blood.

Alex reluctantly retreated back into Maggie's living room, she suddenly felt uncomfortable, like she was invading Maggie's personal space. It was only 4 o'clock and it was too early to call her mom to discuss the night's events. She was too wired to sleep so she made herself a coffee, cleaned out the decomposing food from Maggie's fridge and then settled back on the couch and flicked mindlessly through the channels until she found a random documentary to try to distract her until the women woke up.

It was her phone screaming, rather than her sister, that woke Alex from her troubled dreams once the sun had risen. She groaned as she struggled to find her phone as she teetered precariously on the edge of Maggie's couch. By the time she grasped the phone it had stopped ringing. The missed call was from a withheld number and Alex waited for it to start to ring again but it didn't.

She rolled off the couch and struggled to her feet, stiff from the awkward position she had ended up falling asleep in, and made her way to Maggie's bedroom, hovering uncertainly in the doorway.

Maggie was still curled up on her side, Kara was now burrowed into her shoulder.

"I tried to move but she held on tighter," Maggie called to Alex.

"Are you okay?" Alex asked as she moved towards the bed.

"I really need to pee," Maggie tried to laugh.

"Kara?" Alex tried to rouse Kara from her sleep.

"Kara?" she shouted as she pried her sleeping sister's arm from around Maggie just enough for Maggie to wriggle out.

Kara sighed but didn't open her eyes as she tried to snuggle back into the void left by Maggie's departure. Alex tried to shake Kara awake but when she didn't succeed she placed a pillow in Kara's arms instead.

"I'm sorry about this," Alex apologised as she turned back to look at Maggie but her ex had already left the room.

Alex headed to the kitchen and put the kettle on for Maggie and then hovered anxiously at the counter, waiting for Maggie to reappear.

"You look better this morning," Alex smiled nervously as Maggie emerged from her bathroom, "How are you feeling?"

"Groggy," Maggie returned the smile and then pulled out a couple of mugs from her cupboard. "And hot, your sister is burning up. Are you sure she should be out of the DEO?"

"Actually, I don't think you should be either," Alex frowned.

"Why? You said my blood tests were fine," Maggie turned to look at Alex properly for the first time since they had been reunited.

"Well…um…" Alex stuttered under Maggie's stare. "Both of you are clearly still being affected by the alien sedation."

"How do you mean?"

"Last night Kara was having a nightmare. She was screaming and you didn't wake up, you didn't even stir."

Maggie frowned but didn't respond as she reached into her fridge for the milk for her coffee.

"Do you still take your coffee black?"

Alex nodded in reply and watched Maggie pour the milk into her own mug.

"I think we need to run more tests on both of you."

Maggie remained silent as she stirred her coffee, maybe for a little bit too long.

"I feel better though," Maggie finally offered as she handed Alex her coffee and then moved to sit on the couch.

"I know, but I really think we need to be sure," Alex followed Maggie but stood awkwardly next to the TV. "Look at Kara. She got hit with the same thing as you and she's definitely not okay."

Maggie nodded.

"I'm going to get J'onn to take Kara to the DEO, there's no way I can get her there by myself, but I want you to come in as well."

"I told you, I feel better."

"Please just let my mom check you over, just to be sure." Alex pleaded.

Maggie took a long sip from her mug but avoided Alex's desperate eyes.

"Do you know where my phone is?"

"Mags, please?" Alex took a step towards her.

"I'll come to the DEO, I just need to make some calls first," Maggie sighed.

"Good." Alex walked to the dresser next to Maggie's front door and picked up a plastic bag. "This is everything you had on you when Supergirl flew you to the DEO." Alex handed Maggie the bag.

"Thanks."

"I'm going to call my mom and then J'onn," Alex waved her own cell phone and headed to the front door, wanting to give Maggie some space, even if she couldn't remove the Kryptonian that had taken over Maggie's bed.

"Hey, Alex?" Maggie called to her.

"Yeah?" Alex swung around quickly.

"Thanks for the last few days, for staying with me at the DEO and for bringing me home yesterday."

Alex nodded, too overwhelmed to respond properly, and then headed out of the apartment.