When I was sixteen, I wallpapered my bedroom in a warm amethyst. The kind of colour you would get if you took some blueberry jam and mixed it with milk until it was neither a dark nor a light colour. It looked really good with white borders, and barn red doors and surprisingly didn't clash with my burnt orange bed nor my green desk (remember, I was sixteen).
During the night, it was a really good colour, since it gave the room a calm, cosy, enveloping feeling. With a few lights placed at the right places, to spread a warm glow over my favourite reading chair, over the bed etc. I don't think any bedroom could become much more inviting than that. However, it was not a good daytime colour because the same qualities that at night made it feel calming and enveloping, made it kind of drab and boring during the day. It sort of absorbed light during the day, if that makes sense? Making the room feel grey.
I really started craving a warm, golden glow living in that amethyst greyness. And one day I caved in to it and bought myself a can of the most beautiful yellow colour you can ever imagine. It is this strong cantaloupe yellow, like liquid sunshine or perhaps a glass of orange juice, but tempered with undertones of beige sand. So even if it is a strong yellow, it is a very neutral colour. Which sounds strange, but because of the undertones in the yellow it changes colour from this beige golden sand, moving towards yellow honey as the sun starts to filter through the curtains, and then to a warm cantaloupe towards the evening when my room grows darker. Really, the perfect yellow.
So, depending on how you use your bedroom, keep in mind that different colours will look different during different hours of the day. Also consider when you might want to repaint again, and if you are a person who are influenced by the season with regards to which colours you are drawn to. I very much am, so when I want to redo a room during spring, I am drawn towards light pastels. During the autumn, to warm earthy colours. I am aware of this in myself, and therefore when I paint a room (something I don't want to do more than perhaps every 5 years or so) I always try to keep the colour somewhat season neutral.
So, consider not only if the colour will look great right now, but how it will work with you and the kind of decorator you are during a year or more.