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For people who had / tend to have unrefreshing sleep (but mostly no problem with getting to sleep and staying asleep)
Not just stuff you take / tried because you saw it recommended and maybe it does something, but what's something you do or take that noticeably makes you feel more refreshed / less tired on wakeup most of the time?
No caffeine after 10-11am helps quite a lot. No caffeine at all helps immensely, night and day difference.
This may differ for each individual, as people have differing speeds of caffeine metabolism, but here's why...
- Caffeine blocks receptors that use Adenosine.
- Adenosine is the chemical your brain begins to produce, upon waking, when there's enough of it at the end of the day it makes you feel tired.
- When you sleep, your body then uses up the adenosine
- Adenosine is one of the primary chemicals that assists with putting you into deep and restful sleep.
- Adenosine receptors are blocked, not the production of it. So it builds up when there's still caffeine in your system
- With a 5hr half life on average, there will still be trace amounts of caffeine in your system still blocking some adenosine from being used.
- Your adrenalin levels come down a few hours after the caffeine was consumed, so you don't feel the energy hit, but your adenosine receptors are still being blocked to an extent.
- This blocks your body from entering the most optimal deep sleep.
- Also means you may wake up with unused adenosine left over from the previous day, this is why (as a caffeine consumer), you feel groggy even after 8 hours sleep, and dependant on your morning coffee to block the remaining adenosine and feel 'awake'.
- This can easily create a negative feedback loop where you slowly retain more and more adenosine from each previous day, as you ingest more and more caffeine to stave off the effects of blocking the adenosine during sleep.
Caffeine is in a lot of stuff, not just coffee. Most soda has caffeine for example, and many people enjoy their soda at night time. If you ever go cold turkey don't be surprised when you sleep 12+ hours and sleep through alarms, the first night of no caffeine consumption. That's your body finally able to utilise all the adenosine that has gradually built up over time, and often times there's a lot of it.