What sleep can't do:
Do your requirements while you're in dreamland.
What a pessimistic mind can't do:
Anything---
What a worrywart can't do:
Use time wisely.
What a preoccupied person can't do:
Think of beautiful things.
What an overload of schedule can't do:
Adjust its time for you.
What stress can't do:
Kill its killer.
What seemingly endless tasks can't do:
Endure forever.
What you can't do:
He can do.
