How to turn off vibrate on watch while sleeping

Is there any possible way to disable the vibration of the Apple Watch at bedtime? At bedtime I turn the silent mode on with the bell icon on the watch and I also turn sleep mode on so I can monitor my sleep but if a call comes in, my watch still vibrates - waking me up. I also silence my phone with the button on the left side of the phone. I like the vibrate feature on the watch during the day but not while I'm sleeping. Thanks!

Thanks!