"omg! i tried belsomra for the first time after several years of taken ambien. my doctor told me to try it so i could get off the ambien. well the first 10 minutes after taken, it i got a horrible and quick pain on the left side of my brain..it was so bad i let out a loud ouch!  i did not get sleep was up all night and the next day  i did not have to work. my behavior was like someone with narcolepsy up and down all day.  now i don&#039;t know if this has anything to do with it but i hadn&#039;t had a cold or cold like symptoms in 10 yrs and after taken belsomra for 1 day i got sick.  i will never take belsomra again.  i will go back to ambien.  i contacted the fda and told them about my side affects."