I took Lexapro (for 6 mths) in the morning. I dun feel groggy and jittery. How long have you been taking Lexapro?? If you are just starting taking it...give your body some time to accept the medcine. But if this concern you yes pls. speak to your Dr..
I'm on Lexapro myself and found that it made me tired during the day so I take it at night now and things are a little better. My Dr said that was fine.
How long have you been on this med? Many times we get the start up side effects and they get better after awhile.
You should discuss this with your psychiatrist. I know I was never dosed on any antidepressant I've been on at night -- either it was morning or in divided doses, which reduces sedation.