insomnia - donna
"Donna," she heard from the console room. "You're still awake?" She looked back. The Doctor had been off, tinkering with the library or something. Donna sat with her feet dangling out the TARDIS door. Months ago, that would have terrified her half to death, but now it was almost second nature. She shrugged, smiling at him and sliding to her left so he had room to sit.
He squeezed in between her and the door and they sat in silence for a moment, watching the stars burn from afar. "Hard to sleep sometimes."
"Yeah? Why's that?:
"I don't want to miss a single thing. All these planets and things, whizzing about the universe, while I'm snoring in bed? Don't think so." She sighed, leaning back on her hands. "Well, it's not like you have to worry. You never sleep."
"Gift of the Time Lord." He paused for a second, and they slipped into another comfortable silence. It was hard to make small talk when the stars were splayed out under your feet. "You should sleep, Donna. There'll be an adventure in the morning."
Donna shifted, reluctant to get up. "Isn't there always?" She yawned. "I suppose you're right, anyway. I've got all the time in the world to see this. Guess I just can't get enough."