Are you able to feel the wetness spreading scross your crotch when you wet? If so, I suggest standing up when you feel your diaper getting wet. Wetting in a sitting position always leaves you prone to leaks. Also, try emptying your bladder at will (if you can) every 15 or 20 minutes. Your diaper should be able to absorb the wetness properly and give you some measure of control over leaks.