The 62-year-old singer - who revealed he hasn't slept properly since the 25-year-old socialite was found dead at her home after taking heroin on April 7 - admitted that a recent comeback gig at Volkfest in Plymouth, Devon, has helped him cope with the loss.
The Boomtown Rats star - who performed at the annual festival on May 25 - said the experience was ''cathartic'' and helped a ''part of him come out.''
According to The Sun newspaper, Bob said: ''It's that thing people say - some other part of you comes out. And I guess that's right. In that regard, it's very cathartic.
''There's a lot of things going on in my head at the moment and you can just purge them and the crowd allow you to do that.''
He added: ''I'll sleep well tonight which is the first time in weeks I've slept well.''
During the performance Bob didn't mention Peaches - who was found dead at her detached home in Wrotham, Kent, which she shared with her husband Thomas Cohen, 23, and their sons, 12-month-old Phaedra, and Astala, two - but described the gig as ''remarkable''.
He said: ''You walk on the stage and you want to be mega, and if the crowd is going crazy then it helps.
''Playing the songs again, that I wrote years ago, is exciting. I can remember writing some of them but not all of them. But they could have been written yesterday.
''You are never really aware that the sound you make is powerful after such a long gap. You get together and you said, 'F**k, I didn't know I was in a good band'. You hear it as a punter again.''
An inquest into the death of Peaches found that heroin was ''likely'' to have been involved - the same drug that killed her mother Paula Yates in 2000.
A full inquest into her death is due to take place in July.