Sleepyhead/ˈsliːpihed/ Definition 1 of 2Pro Tip 1/3Colloquial Tone Use 'sleepyhead' in casual, informal conversations with close friends or family. We've got a plane to catch, sleepyhead! Get moving! Pro Tip 2/3Not for Work Avoid 'sleepyhead' in professional settings because it's too casual and may seem disrespectful. N/A Pro Tip 3/3Humor and Affection 'Sleepyhead' often carries a playful, teasing tone between people who know each other well. Wake up, sleepyhead! Or you'll miss the pancakes!