Feedback from internal clock neurons controls fruit fly sleep and activity patterns

A subset of dorsal clock neurons (DN1s) may significantly influence sleep patterns in Drosophila by releasing glutamate.

• DN1 neurons directly inhibit key pacemaker neurons that promote morning arousal.
• A feedback circuit possibly drives midday siesta and nighttime sleep.
• Real-time activity monitoring suggests DN1 neurons are more active in males than females.
• Increased DN1 activity correlates with higher temperatures, which may lead to increased sleep.
• These findings indicate DN1s play a crucial role in integrating environmental cues with sleep regulation.

Simplified