Most indoor lighting only has a certain color spectrum so they wouldnt effect sleepiness like the sun would. From my personal experience with sleeping with the light on, waking up and becoming alert quickly is much easier. When it is dark, I find its much easier to fall back asleep. Its my guess that after a while, your mind will probably get used to the lights and you may find it harder to wake up despite the light. But who knows, it could work indefinitely! kudos on the recall anyways :)