In reply to mypyrex:
A few years ago at the end of December, I was heading for Camban from Gleann Lichd when the big snow drifts impeding my progress, and obliterating the path, meant I lost the daylight before reaching the bothy. So after making a dinner from re-heating snow for water and a boil-in-the-bag and coffee, I got my sleeping bag into my orange survival bag out then bivvied in the open.
It was mostly clear, so once in the sleeping bag, quite a luxury. Poking my head out to star-gaze was quite intense. However, the wind picked up from about 3am-ish, meaning spindrift was regularly blown into my bag, and I mostly abandoned sleep as my wary eyes were busy watching the weather deteriorating and I was making mental plans on what to do if the weather got really bad.
Next day rose after 8.30 and struggled on through the snow drifts to find the bothy. I had this ongoing nightmare that I was going to find that the bothy was, in fact, only yards away, but it was a couple more difficult miles further along.
A memorable night and pleasant in retrospect. But it was LONG! In my bag at 6pm and there till after 8am. And as the wind was picking up, it was uncomfortable and not too pleasant thinking of how it may get worse. Glad I've done it, though I'll be happy not to have to do it again.
Post edited at 12:59