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This could also be related to sleep.

- Alcohol reduces the quality of your sleep, so you'll likely be playing catch-up regularly if you drink regularly before bed.

- Removing alcohol often removes the social situations surrounding alcohol, such as going out drinking till late. This means less alcohol will help stabilize your sleep cycle and keep you from spending too many nights out late.

I found that (during a difficult undergraduate course) sticking to a strict sleep schedule (and getting sufficient sunlight in the mornings) had a very positive effect on my cognitive ability.