It also depends how old you are, elderly folk go to bed and wake up early, especially, in the summer months when it gets light by 4am. I'm 65 nearly, sometimes I go to bed at 3am and sleep for about 5 hours, I have a nap during the afternoon to compensate for any lost sleep. We're all humans and have different sleep patterns, I often have a nightcap, or, two, before retiring for the evening, which makes me drowsy by default, I can get a few hours kip in before I wake up.
I wouldn't worry unduly about it, however, if it affects your blood sugars, etc, then best to take medical advice accordingly.
All the best, look after yourself.