Do bees sleep? Yes, well maybe, they certainly roost, sometimes communally. Here's a male Nomada hanging from the tip of a bramble leaf by his mandibles, waiting for better weather at Sandy Smith NR today. (Many bees grasp foliage in their mandibles when they roost out in the open like this). Imagine if it started raining, he would have a torrent in his face!
While photographing it in gloomy blustery conditions the sun briefly came out and he twitched his legs as though coming out of a deep sleep, then it clouded over and he went back to his Zzzzs.