"this is the first time i took unisom. i&#039;m pregnant and have been having trouble sleeping. i took it the first night and i as asleep within 30 minutes. it was the best sleep i&#039;ve had in awhile and woke up feeling great but the second night taking it didn&#039;t go so well. it didn&#039;t make me drowsy one bit. i tried taking a second pill and nothing worked. i&#039;m not sure why it worked the first night for me but not the second. :("