What kind of blanket should I use to cover my parakeets cage
and how much is it supposed to cover
Something as light as a sheet to a light weight towel will work. The darker in colour the better. It is only meant to shut out light .. It still needs to breath, and be temperate.Birds will sleep only if they feel safe and secure .. a darkened cage gives them a sense of well being and will provide them with a feeling of safety.
I have a parrot. I cover her with my New England Patriots Snuggie!
You should use q thin one that air can easily pass through. Parakeets have very sensitive respiratory systems.
A towel works for me and is your age against the wall on one side?