I have been suffering from bad bouts if insomnia for 6 months. In that time my doctor has given me 50mg promethazine (25mg wasn't strong enough to sedate me due to the severity of my insomnia).

The only problem with this medication is it takes over an hour to kick in and it leaves me groggy most of the next day. I told my doctor this and I have been given a weeks course of zopiclone, my main concern is worrying that it won't work on me, so my question is if 50mg of promethazine gets me 6 hours uninterrupted sleep will 7.5mg Zopiclone? Is the latter even more sedative than the promethazine? Thanks.