Blue is very often recommended for bedrooms and bathrooms as it is known for bringing down blood pressure and heart rate. The relaxing, calming and serene atmosphere it creates come in a variety of hues - from rich and royal to pale shades.
Pastel blue looks incredibly good on the walls if your bedroom receives plenty of natural light. But don't forget to balance it with warm hues for the furnishings and fabrics.
While light blue has the calming effect, dark blue has the opposite effect and you should remember to use it in moderation. You can paint just one wall in dark blue or add decor accents, but don't include it in your main color scheme.
On the other hand, a sky blue wall is perfect for a city dwelling. It softens the impact of the hard lines and surfaces and welcomes the natural bright light. This way, the room will still be colorful, but with a calming vibe.
For a bright bold paint color, the best solution is to use a single accent wall in your bedroom. You can add a patterned headboard that will make a nice focal point in the bedroom.
If you rather prefer to paint all the walls in blue, go for a softer hue, closer to a gray-blue. Space will be highly relaxing and dreamy.