Change in the sleep cycle due to Covid -19 lockdown

I am locked inside an apartment for last 60 days and have not been able to walk at all.
I am not sure if this is the reason or not but nowadays, I have stopped getting proper sleep.
I get up at 3 AM in the morning and find it hard to sleep again.
I also don’t get sleep that easily while going to bed.
Many times, I have to take melatonin to get sleep at the night.
I am not sure what to do at this time.

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