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It's something physically
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Mostly it makes you feel awake.
Get a sleep tracker to evaluate your sleep quality first. People who have attention issues often have shitty sleep quality as well. Total time asleep, estimated REM sleep and deep sleep will be most informative. You're supposed to get 2H of REM and 2H of deep sleep each night so if your estimate is closer to an hour or less than that should indicate that sleep quality is the primary factor and it's better to address the source of the problem than patch over it with band-aids.