When you go through this phase you will definitely have the answer to how to jump higher. After a long day what the body needs is a good nights rest. According to science a normal human being requires 6 to 8 hours of sleep daily. This time allows the body to regain the lost strength and become better prepared for the next days challenges.
Some people will avoid this because of which they will get exhausted much faster than before. this will lead to a decline in their progress. So adequate rest will solve the problem and give new strength.