Very tired during morning sit

hi all.

I've been sitting regularly for two hours a day. One in the morning and one after work. While I have been doing Vipassana mostly I recently started reading the seeing that frees by Rob Burbea and have been working with the energy body and insight.

About half the morning sits I have a very difficult to get through. Either agitation or drowsiness. I'm sleeping enough. I'm not neglecting any of my needs or at least I don't think. And this has been also happening with me when I was practicing Vipassana primarily.

just reaching out for some advice or pointers. My morning said sometimes I can barely stay awake while my after work sit is so fruitful