Both, I think. Though with me, if the sleep goes, mania comes on very shortly.

I am not a drinker (really not, like have maybe had 5 glasses of wine in over 40 years of living), but I'd imagine sobriety is important too. I grew up in a family of non-drinkers; my dad didn't grocery shop, and my mom didn't buy it because my grandfather, her dad and all his siblings and their offspring, was an alcoholic. Then, I married a complete non-drinker. Both of H's parents didn't drink because of the church they attended, either the church creedence didn't believe in drinking or those were the days of dancing in public being shameful. H's parents grew up in the depression era. So I ended up a non-drinker, and I think that is a good thing.