1. A recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time
   - orthodox sleep, NREM sleep, nonrapid eye movement, NREM

Type of: sleep, slumber

• oral fissure
• oral herpes
• oral personality
• oral phase
• oral poliovirus vaccine
• oral presentation
• Oral Roberts
• oral sex
• oral smear
• oral stage
• orally
• Oran
• orang
• orange
• orange balsam
• orange bat
• orange daisy
• orange fleabane
• Orange Free State
• orange grass
• Orange Group
• orange grove
• orange hawkweed
• orange horseshoe bat
• orange juice