Hello and welcome to Dreamviews.

The answer to your question is probably yes, but it varies between different people.

When you sleep for 7 hours, do you feel rested during the day, or do you need coffee or other cafineated drinks to function? If you do, you are not getting enough sleep and the extra two hours should help your dreaming.

During the early morning is when most people dream more often, in fact, during your last couple of hours, you are almost constantly in a dream state.

Give it a try, I suspect it will help.