Tired after work

Have you ever had those times when you became relaxed and suddenly realized how tired you are?

It's been happening to me recently. Outside, I'm energetic and effective, but when I get home at night, I feel tired.

I think I'm subconsciously adopting the "game face" thing I get annoyed at others for doing, for being fake.
It's also amazing how tired 10 hours of truly focused, non-repetitive work can make you.

I guess I need more sleep. Night! :)

Update: After 10 hours of sleep last night and a nap after lunch, I'm feeling better. I felt like throwing up shortly after writing this, and it was mortally frightening.