Sleep and strength training

I’ve been thinking a lot about sleep lately, especially since I started strength training again. I mentioned this before, but I’m 7 years postmenopause and not on HRT, so I’m kinda figuring things out as I go. My doc’s been on my case about my LDL, and I’ve been lifting heavy to try and get that under control.

But what I’ve noticed is that my sleep’s been all over the place - some nights I’m out like a light, and others I’m wide awake at 3 am. Has anyone else noticed a link between strength training and sleep patterns? I feel like I’m getting stronger, but I’m also feeling really exhausted all the time.

Is that just part of the process, or is there something else going on?