The desert in my head

My mind is a desert
A barren wasteland
Parched and empty of thought
Except for a lonely idea
Flashes through and disappears again
Tumbleweed in the distance.
Occasionally a thought appears
An oasis in the heat
I go nearer and it spills away
A mirage
I nearly cry but I don't want to lose moisture
I wander in desperation
Lonely as the proverbial cloud.