I have been observing my sleeping patterns from several days. Here are my observations:
- If I sleep at around 12:00 AM, I wake up at around 09:00 AM. (9:00 hour sleep)
- If I sleep at around 02:30 AM, I wake up at around 09:30 AM. (7:00 hour sleep)
- If I sleep at around 04:00 AM, I wake up at around 10:30 AM. (6:30 hour sleep)
- If I sleep at around 05:00 AM, I wake up at around 11:00 AM. (6:00 hour sleep)
These observations are made when I don't use any alarm and wake on my own. So, Now, I am wondering why I daily wake up around 10 AM no matter how many hours I sleep. What is the reason for this? Also, Some time I plan to sleep early (around 11 PM) and wake up at around (4-5 AM) but most of the time I fail even after using an alarm. Why it is so?