Flooring
One mistake more and more people are making, is selecting cold flooring; ceramic tiles, marble etc. Use laminated flooring, wood or carpet! Imagine stepping out of bed on a cold wintery morning on even colder flooring! But if you already have cold flooring, put a rug/carpet near your bedside. Makes those early mornings steps a bit more bearable.
Curtains
Most people go for dark curtains when designing their bedroom. The thought process is correct, it will be a little bit darker making it easier to sleep. But if your walls are already dark, then go for light coloured curtains.
Lighting
Use lampshades, pin lights and up lights. These type of lights give a nice mood to your room, especially for when you want to rest.