As you will see,

The first study does not meet our criteria, as the outcome is different from what we are planning to study
The second study will not meet our criteria as we are not interested in any particular subgroup of patients or individuals, all adults, so it does not meet our 'P' criterion
The third study 'may' meet our criterion, so we will select this study for the present
The fourth study also may meet our criteria for selection from a more physiological perspective so we will keep this study for analysis
The fifth study will not meet our criteria as it has breast cancer survivors for 'p', while we have decided to work for all adults, not just particular subgroups
The sixth study will also not meet our requirement as we are not interested to study insomnia
The seventh study may meet our criteria
The eighth study may meet our criteria as well
The ninth study will not meet our criteria as we are interested in all adults or patients, not a particular subgroup

So, based on our PICO criteria, we decide to include the following four studies for our analyses: