noun
a person who is lazy or slow to get moving in the morning
adjective
having a tendency to fall asleep easily or often; drowsy
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The sleepyhead struggled to stay awake during the important business meeting.
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Hey sleepyhead, wake up and smell the coffee!
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Quit being such a sleepyhead and get your act together.
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Her dreamy eyes and slow movements earned her the nickname 'sleepyhead'.