I am on my 4th day of Lexapro 5mg. I used to fall asleep quite easily but my sleep was pretty bad (would wake up many times during the night from my heart beating too fast) and now I can't seem to even fall asleep. I was on Remeron before that (only for 6 days) so maybe because that drug made me sleep non stop, quitting it caused insomnia? Or is this Lexapro side effect? Does it go away with time?