90 Minute Timer

This 90 minute timer is perfect for timing complete sleep cycles, extended study sessions, or watching movies. Sleep science shows that 90 minutes represents a full sleep cycle, making this timer ideal for power naps. The timer starts automatically and alerts you when time is up. Adjust the duration with the controls if needed, or use the reset button to start over. No downloads or sign-ups required - just a simple, effective online timer for longer time periods.