I do 35+ mi every other day. I can feel conked some time after the ride. that is usually a good thing. But i really feel exhausted if I don't have some recovery drink and stretches.
Immediately after the ride, take a recovery drink or a large glass of chocolate milk. Even though you have stopped riding, your muscles need protein and carbs to recover, lest they become sore and fatigued. Also do stretches of your quads, calves, hamstrings and optionally to your triceps, back, and shoulders immediately after the ride. Works for me..