It's invigorating. It's like... taking a shower in light. You lose yourself in it.
Like a floatation tank?
Actually, no. More like... In psych tests on deep space, I ran a number of sensory deprivation trials, tested in total darkness, on floatation tanks - and the point about darkness is, you float in it. You and the darkness are distinct from each other because darkness is an absence of something, it's a vacuum. But total light envelops you. It becomes you. It's very strange... I recommend it.