Playing only when refreshed

I would like to improve my chess and when I get home from work on weekdays I do not feel refreshed to say it directly.

I guess I should only play in the weekends, but I would like to play during the week also. Blitz chess in the lunch break must be the way ahead. 

Any suggestions for chess activities during the week? Video lessons on chess.com maybe.

I've learned the hard way not to play at work. I do tactics here and there or read articles. I have a couple of move by move books, I like recreating and learning about famous games.

What works for me. After I get home I realax a bit, eat supper and then play one game of blitz when I feel like my concentration is good. Other times I study endgames, et al. I do not like to play several games in a row.