Sweet Naptime

Sweet Naptime is an Achievement in Halo Wars that is unlocked when the player puts every colony in hibernation at the same time on The Flood.

It is worth 5 Gamerscore.

Tips
Play the mission on Easy difficulty with the Catch, Sugar Cookies, Pain Train, Bountiful Harvest and Emperor Skulls active.

Send a pair of Gauss Warthogs to each of the colonies and kill them to put them into hibernation.

Do this for each of the colonies. They respawn in 4 minutes.

You can choose to lock down a cobra outside each colony to permanantly weaken the Proto Gravemind and have time to build an army to defeat it.

Trivia

 * The achievement may be a reference to Red vs. Blue in which Caboose has an obsession with "naptime" and sleeping in general.