There's no specific bed time for me but usually I do sleep late because I feel like I can do more things at night than daytime.
We have the same thought about being productive but my body clock has changed all of the sudden.
Before, I can sleep only with lesser hours but this time it's changed a lot and became a little longer.
But I try to sleep atleast 6 or 7 hours a day so that my brain and muscles can rest too.
Usually, it has to be 7-8 even for adults but maybe because of many things that we think or overthink, it affects our health and sleeping time.