Even with the full 8 waking up and moving around at the start of the day is fatiguing. Even when we are young.
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Sleep debt is real and it’s a debt that always gets paid. Another option might be dehydration. Even though everything in your body slows down, it’s still running. You are still sweating a little, kidneys are still flushing out the toxins. That’s why you pee first thing in the morning. It’s trying to find the balance between drinking enough water to stay hydrated but not so much water that you have to get up half way through and pee.
There was an article recently saying that humans are not really built for 8 hours of straight sleep. The traditional sleep pattern up until the late 1800s was two 4 hour sleep periods with about an hour awake in between. It was called 1st sleep and 2nd sleep. The in between time people would use to read, pray, have sex, or just talk. It was so common in the 1700s that people would go talk to neighbors.
It wasn’t until the modern work schedules and electric lighting that the solid sleep block really developed. When we sleep today we still have 4 hour sleep blocks, usually a 1/2 hour of light sleep before slipping into REM sleep, then back to light sleep for a while then another REM cycle before waking.
There are a couple of phone apps that use your smart watch to keep track of where you are in your sleep cycle and adjust your alarm slightly to go off when you are in a lighter phase of sleeping.
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