"i have had my hydroxizine rx for a while but never took it. started feeling kind of anxious last night so i took 25mg. i must&#039;ve passed right out because i don&#039;t remember when i fell asleep! i slept very well but woke up with a weird groggy feeling. i also felt really relaxed though which was really nice. grogginess/ brain fog can sometimes exacerbate anxiety for me so i had some caffeine and that seemed to help."