Dairy's probably not gonna help... it's insulinemic (spikes insulin, which sends you to sleep).
Other than that, perhaps you're overtraining?
When I go heavy on the big barbell lifts I always end up pretty tired. They do take it out of you.
Something lighter like kettlebell swings are less fatiguing and will wake you up. They'll keep your glutes/hams strong too (yep, really) if you want to lay off the squats/deads for a bit.
Maybe take a week off, and come back to it fresh?
Also, bedtime? If you're not getting to bed before 12pm on that lifting regime and getting a solid 8 hrs, you're probably under slept.
Other than that, perhaps you're overtraining?
When I go heavy on the big barbell lifts I always end up pretty tired. They do take it out of you.
Something lighter like kettlebell swings are less fatiguing and will wake you up. They'll keep your glutes/hams strong too (yep, really) if you want to lay off the squats/deads for a bit.
Maybe take a week off, and come back to it fresh?
Also, bedtime? If you're not getting to bed before 12pm on that lifting regime and getting a solid 8 hrs, you're probably under slept.