Having had sufficient (or even more than enough) sleep or rest to function optimally during waking hours.(adjective)
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Use "well-rested" in a sentence
"We hope that being well-rested, well-fed, and well-intentioned will buy us more care-free time of good health until our ultimate hour."
"Although we are being careful when out in public places and we're trying to stay well-rested, eat right, stay hydrated and dose up on vitamins A, C and E."
""After so many weeks of training, you're finally well-rested and ready to run," says Dengate."