I'd also ask yourself why you are so tired you need a rest between meetings. If you are fit and well you shouldn't need a physical rest, though you may want to give your brain a break for 5-10 minutes.
You don't give away personal information on here but here are a few questions to get you thinking
- do you have a recognised medical problem causing tiredness?
- do you get tired at weekends between activities, when it's not a work thing?
- do you need to see a doctor about your tiredness?
- are you getting enough sleep?