I've taken Lexapro and Adderal for quite a while now. I've always taken the Lexapro in the evening around the time I have dinner (supper to some).
I don't think Lexapro would cause you not to be able to sleep, on the contrary, if anything it would do the opposite.
Wouldn't hurt to take it in the evening.
Think Lexapro can go either way. Made me tired. Can give you some very vivid dreams too. I take Lexapro and adderall xr...so does my daughter....the lexapro have taken for about 2 years...it really helps with my moods...but it makes me soooooooooo sleepy...and my daughter too...we have cut back to 1/2 tab every other day...and when we do take it we are knocked out...very hard to get up in the morning...when I tried to quit taking it I got "brain quakes" and your body gets sore like you worked out...or like you have the flu....I also realized that my major irratability was coming back and so was my daughters....I like the way it makes me feel emotionally, but I can't stand that it makes me so tired...I take it just before bed...if I took it during the day I would be in bed...it knocks me out...also major info...Lexapro takes about 30 days to build in your system..does not work right away so whatever is going on with you is prob just something else and has nothing to do with the lexapro...
When I started taking Lexapro, it made me tired. However, you just have to experiment yourself with the times of day that you take it. I used to take it at night time before bed, but then when I would go to bed I would fall asleep but I would be very rowdy, tossing & turning all night long. Now that my body is used to the meds I take it at lunch time & I don't get tired at all from it.