I can very easily plot how good I feel on any given day against how consistent my sleep/wakeup times for the last week have been.
If I know I fell asleep at midnight, and woke up at 8am every day for the last week straight, damn will I feel energized today. But if I know last night I got to bed late, then went on my phone, and hit snooze on my alarm, yup I 100% deserve the grog and demotivation I have today.
Isn’t it crazy how much effort they’re putting in to protect CEOs?