When we forget to be mindful, we can walk around collecting all sorts of mental rubbish. It's a bit like an old rubbish tip by the time we want to sleep. But lying with a rubbish tip isn't the easiest way to sleep. So maybe, really looking at the rubbish, deciding if it is something you want to keep or, not! Then let it go on the out breath, simply returning and piece by piece letting go. If it lingers, breathe it in - and let it go on the out breath, breath by breath, by breath.