sleeping less to meditate more?

I can devote 7 hours total to meditation + sleep per day. Should I do 5 hours of sleep and 2 hours of mediation (1 hour twice) **or** 6 hours of sleep and 1 hour of meditation? Please explain your reasons why. Will 2 hours of meditation increase my productivity? Please explain from your own experience, not any bookish knowledge Will meditating twice give me **twice** as much benefit as meditating once?