Mirtazapine

Hey guys and girls. I've been put back in mirtazapine again after 3 years of not taking anything other that propranolol from the past 2 month, last night I took my first mirtazapine and it completely knocked me out. I woke up this morning after a decent sleep but had mad dreams and I still feel kinda fuzzy but not in a bad way but id say spaced out a little. This doesn't happened every time does it? I am on a 15mg dose for two weeks to take on a night but after At am on 40mg to take on a morning it's not gonna knock me out again on a morning is it?? Please tell me ur stories. Thanks

J