3rd trimester insomnia

Is anyone else having a hard time falling asleep or tossing and turning ALL night? I could be so exhausted after a long day, fall asleep and wake back up in a hour. It seems like I can only fall asleep on my left side with my legs completely extended. I have 5 weeks & 4 days left. How are you ladies dealing with this? Do you take a benadryl? I haven't tried that yet. I heard if you're sleep deprived, that means a longer labor!