We've had this problem recently too! Sophie is just 7 1/2 months old, but was pretty much trained to go outside when we're home, and on the pee pad when we're not. She always slept with us since she was a pup, and never had accidents in the bed! All of a sudden she's having accidents at night! Just last night we put her in her kennel because she did it again! Very frustrating! We make sure we take her out before bedtime. She always woke us up before, and now is just politely wetting the bed! Any suggestions are welcome!