Yes, they will turn their heads back and tuck under their wings
yes
no, they do not, horses are the only known animals to sleep standing up.
nope, they like to curl up when they sleep, but a horse does sometimes sleep standing up.
Most budgies will sleep at a certain part of a cage. If you have one of those small swing perches they might sleep there every night. It is nothing to worry about.
No, rats cannot sleep standing up. The only mammals that can sleep standing up are large herbivorous mammals, like horses. They sleep standing up because it is sometimes difficult for them to stand up for lying down. Some birds, like flamingoes, sleep standing on one foot.
They sleep standing on one leg and rotate during the night.
My cockatoo tucks her head into her shoulder and stands on one leg when she sleeps. Many other parrots sleep this way. Some will burrow down into newspaper on bottom of cage to sleep and some will go into a nestbox to sleep.
They sleep standing up. They can be kept in a barn at night with hay to eat and water to drink and will sleep standing up in their stall. they sleep standing up on the ground, in a paddock or barn, free of charge unless your agisting
Yes, most horses sleep standing up but sometimes they do lie down.
Laying down. They doze standing, but for a deep sleep, they lay down either on their side or with their feet tucked under them and their heads pulled in towards their rear.
No, they sleep laying down.
Elephants do not lie down and sleep. They sleep standing. You know why? They are afraid ants might get into their trunks