How come my toe nails are always yellow in the moring, but not at night?

Maybe fluid builds up when you sleep?How come my toe nails are always yellow in the moring, but not at night?
Stop looking at them in the sunlightHow come my toe nails are always yellow in the moring, but not at night?
Because in the morning you put them up to a yellow light....and at night you can't see them!!! DUH jk