Back in the '70s spent many long nights on a Vette drag car instead of sleeping, towed it a few hours to its debut race, and when it kicked a rod my 2nd thought was that I finally could get some sleep. Rebuilt a sprint car ground-up in a motel parking lot one night. Had to drop the 180 header setup & change the clutch in a TransAm Javelin in between sessions. Another T/A car, we went 3 days & nights straight wrapping it up before a 4-hour tow pre-dawn; we were literally holding tools and asking where they were, but the car qualified well and ran well until the driver brain-faded & did some off-roading...and he was the only one getting some sleep.
And I'd probably do it again, so I guess I must like a battle.