in case you are being serious................
Nests are just that- nests. they are not homes!! They are used purely for the raising of chicks in the nesting season. Birds do not 'live' in them.
For some small species- wrens or blue tits or the like- old nests may be used in very cold weather for roosting- you can get an awful lot of wrens crammed in an old domed nest. A lot of birds re-use last years- particular the larger species- but most build from scratch. Some dont use anyting other than a cliff ledge- some dig tunnels- kingfishers and sand martins, puffins, shearwaters- though the latter two will happily use a rabbit hole.
Most birds roost in a nice sheltered tree or amongst ivy or the like. One of the greatest spectacles is a starling roost- we have one at Otmoor RSPB reserve- currently around 50000 birds circling lower and lower at sunset till they fall like a waterfall to roost in the reedbeds.