Exercise will not make you more fatigued. Exercise generates energy. Sedentary people who start to exercise feel much less fatigued than those who stay idle. Jumping up and down can give you a jolt of energy. Sudden short bursts of exercise can trigger the release of feel-good endorphins.
Studies have shown that a short walk in the early morning sun can help to increase serotonin levels, and reset your internal clock, helping to reduce feelings of fatigue.
An exercise session 3-6 hours before bed initially raises body core temperature and then lowers it just before bed, offering the same sleep benefits as a hot bath taken 1-2 hours before bedtime.