The first night that the Inquisition party camp near Sahrnia is cold enough that Solas wakes up with ice at the corner of his eyes. The second night is even colder than the first. So, on the third night, when Lavellan hesitantly suggests sharing blankets for warmth, he gratefully accepts.
It is a decision he comes to regret.
Lavellan moves in her sleep. She twists and turns, managing to entwine the blankets entirely around herself with not even a strip spared for anyone else. Solas, his teeth noticeably chattering, shakes her gently awake and indicates to the blanket-hog that he would like to avail himself of some sort of covering before he loses extremities to frostbite.
Lavellan is extremely apologetic. She shakes out the blankets, making sure that Solas is as comfortable as possible before shutting her eyes and drifting off to sleep. Shortly after, now reasonably protected against frostbite, Solas himself returns to the Fade.
He is unceremoniously dragged out of it moments later when one of Lavellan's flailing limbs hits him directly in the gut.
Solas lies there gasping, the wind knocked out of him as his still-sleeping attacker proceeds to once again twist all the blankets completely around herself.
Once more, he shakes her awake (although not quite so gently) and once more Lavellan is deeply apologetic.
He manages five more minutes of sleep before she elbows him in the face and once again steals the blankets.
Enough is enough Solas decides, as he stems the blood flow from his bruised nose. He pulls the blushing, feebly-protesting Lavellan against him and, wrapping his arms around her, cocoons them both in the blankets. Lavellan holds herself awkwardly stiff for a few moments before she sighs and relaxes into his hold and Solas finally gets to appreciate the extra warmth as he returns once again to the Fade.
Ten minutes later, Lavellan headbutts him.