Re: Trazodone 50mg - how drowsy?
Trazodone is unlikely to poleaxe you the way you fear, but why not ask your GP if you can cut the dose in half to see what effect it has on you (I'm assuming you've been prescribed an immediate-release formulation). The reason it is the med of choice for SSRI induced insomnia in the U.S. is that it has a very short half-life, about 9 hours, so its effect doesn't usually carry over into the next day the way other meds prescribed for insomnia often do.
BTW - trazodone is a pretty good antidepressant which usually produces fewer side-effects than SSRIs and other ADs. Its main issue has been the sedation, but slow-release formulations have lessened this by better maintaining plasma levels above the sedation threshold. The usual antidepressant dose is in the 200-400mg range, up to 600mg for hospital inpatients.
You might find this useful: Stahl - Mechanism of Action of Trazodone: a Multifunctional Drug (PDF)
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The opinions expressed above are based on my observations and, where applicable, interpretation of cited data and are general in nature. Consult your physician before acting on anything stated.