The white dots are common on Red Eyes and absoultely nothing to be concered with. They are just normal blemishes and will not affect the frog at all. Some frogs will have more spots then others. Their skin color is usually darker at night probably to blend in with their surroundings. During the day when you wake them or when they are sleeping on the leaves they will be bright green to match the leaves. Sometimes they will darker if they are kept in temps that are too cool. But if they are turing back to a bright color in the morning it is probably not the temp just their night colors. Check your temps and may sure they are being kept within a comfortable temp range. Again, darkening up at night is a normal behavior and part of their blending in process.