After a tiring day, weekend, week.... I can say for sure that lack of sleep or feeling tired contributes to a lack of presence or awareness.
It was much easier to slip into old patterns and habits when feeling tired.
What I did find helpful was to stop wishing for things to be different than they were. When I stopped wishing to NOT be tired, it was as though the "suffering" was removed and only the more factual situation remained. I was still tired, but did not feel as bad about being tired.
Join me in the present!