I smoke sativas all day long because of my narcolepsy and dysautonomia. I find that there are two main effects with most sativas and then a third effect when there are certain terpenes present.
I look for strains that are energy neutral or slightly energy increasing and are not related through lineage to an old land race sativa. Most land race sativas I've smoked have a combination of terpenes or something that'll put me right to sleep. I used to buy Durban poison just for the sleep effect.
A good indica is very narcotic for me, even down to the point of making it hard to pee. I tend to smoke those only in the evening where I don't mind sitting on the couch wondering what I just did with the last couple hours.
J
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