My dawn simulator is keeping my head above water so far. At least when I'm close to waking up in the morning, the light brightens gradually, hits my brain like summer sunshine, and I'm ready to pop out of bed, even at oh-dark-thirty. There was one morning when I didn't have the timer on and it didn't come on, and my husband practically had to drag my sorry carcass out of bed......it definitely helps. Hope I can say the same thing come January.