Caffeine

Caffeine Skill

Prevent Mac from sleeping via CLI or GUI.

Quick Reference

CLI Commands (built-in caffeinate)

# Prevent idle sleep (until killed)
caffeinate -i &

# Prevent system sleep on AC power
caffeinate -s &

# Prevent display sleep too
caffeinate -d &

# All assertions (system + display + disk + idle)
caffeinate -dims &

# Run for specific duration (seconds)
caffeinate -t 3600  # 1 hour

# Keep awake while a process runs
caffeinate -w <pid>

# Kill caffeinate
pkill caffeinate

Check Status

# See what's preventing sleep
pmset -g assertions

# Current power settings
pmset -g

# Is caffeinate running?
pgrep -l caffeinate

GUI App

Caffeine.app installed at /Applications/Caffeine.app

• Click coffee cup in menubar to toggle
• Filled cup = active (preventing sleep)
• Empty cup = inactive

Permanent Settings (requires sudo)

# Never sleep system (AC power)
sudo pmset -c sleep 0

# Never sleep display
sudo pmset -c displaysleep 0

# Restore defaults
sudo pmset -c sleep 10
sudo pmset -c displaysleep 10

Usage Examples

Keep awake indefinitely for voice server:

caffeinate -dims &

Keep awake for 8 hours:

caffeinate -dims -t 28800 &

Check if already caffeinated:

pgrep caffeinate && echo "Caffeinated ☕" || echo "Not caffeinated 😴"

Notes

• caffeinate and Caffeine.app work independently
• System already configured with sleep 0 (never sleeps)
• Display sleep was 180min, now set to 0 (never)
• For voice/server use: system sleep prevention is most important