Before revision: Alertness after waking A study suggests non-genetic determinants of alertness after waking up from sleep are: sleep quantity/quality the night before physical activity the day prior a breakfast rich in carbohydrate a lower blood glucose response following breakfast (modifiable as well, for example via choice of food and with berberine ) The baseline of daily alertness is related to the quality of their sleep (currently measured only by self-reported quality), positive emotional state (specifically self-report happiness), and age.
After revision: Alertness upon waking A study suggests non-genetic determinants of alertness after waking up from sleep are: sleep quantity/quality the night before physical activity the day prior a carbohydrate-rich breakfast a lower blood glucose response following breakfast (modifiable as well, for example via choice of food and with berberine ) is related to the quality of sleep (currently measured only by self-reported quality), positive emotional state (specifically self-report happiness), and age.