What startled and invigorated him was that he didn't care.
"Command"
William McFee
We did not know before it was demonstrated by this treatment that sleep is merely a reduced discharge of motor-nerve force, a partial turning off of the motor-batteries, by which, through rest, they are invigorated for fresh action during the waking hours, and that the degrees of this reduction range in their effects from sleep, more or less deep, down to coma, and can be raised again from coma to sleep, and from sleep to complete wakefulness.
"On Snake-Poison: its Action and its Antidote"
A. Mueller
He waked in the early morning refreshed and invigorated mentally and physically.
"Quicksands"
Adolph Streckfuss