It's completely fine not to make your bed every day. Some people believe that a 'messy' space can spark their creativity.
If sleeping in an unmade bed does not affect your sleep in any way, you might not need to change your routine. A messier room could be the thing that gets your creative juices flowing. However, for others, it can do the opposite.
Making your bed every day might keep you feeling motivated to conquer your daily tasks and duties. This could lead you to feel more productive each day and make better lifestyle choices, but the decision is yours to make.