I sleep with the window open unless it's really cold.

天气若不很冷，我总开着窗户睡觉。

《牛津词典》

There are three main ways that animals survive the cold in winter: sleep, adapt or migrate.

动物在寒冷的冬天有三种主要的生存方式：休眠、适应或迁徙。

youdao

He awoke from his sleep in a cold sweat.

他从睡梦中醒来，浑身冷汗。

《柯林斯英汉双解大词典》

It was too cold for them to sleep much.

VOA: special.2009.07.22

At night, it was too cold to sleep.

NEWYORKER: The Black Sites

In fact, I would play long into the night to keep from having to climb into a bed that was so cold I couldn't sleep.

NPR: Lang Lang: A Life In Music, So Far

"Probably the restriction of movements by clothing could increase the length of sleep, and a cold environment makes swaddling possible without overheating, " she says.

BBC: The babies who nap in sub-zero temperatures