A horrible condition that is the result of copious amounts of Halo 3. The tell tale scenarios of a Halo dream include but are not limited to: sniping rampages, grenade sprees, and riding on ghosts, banshees or mongooses while shooting aliens or people. The only cure for a Halo dream is sleeping with women. Doing so will override the infected brain and render it useful once more, however for most Halo 3 players this is easier said than done.