Instructions
Watch for a bubble to appear above your Digimon's head. This bubble shows what your Digimon wants. Keeping your Digimon happy and healthy will prolong its life.
Press the triangle button when a bubble with "ZZZ" appears over the Digimon.
Select "Sleep" from the list of options that appears. Do not attempt to keep training your Digimon when it's tired, or it may not evolve into a healthy Digimon. Heal your Digimon if they are injured by selecting a medicine from your item list before putting them to sleep. This ensures they won't fall ill while sleeping.