Yup. Also in late 30s, and damn. I used to pull off all-nighters no problem in my 20s. Last night, I needed to do some work that didn't get done before, and

Yup. Also in late 30s, and damn. I used to pull off all-nighters no problem in my 20s. Last night, I needed to do some work that didn't get done before, and by 2am, I was falling asleep in front of my keyboard. Ah, naivete of the young. :)