•to focus your mind to work / unfocus your mind to sleep
•to focus your mind on thoughts to sort out / unfocus your mind on thoughts you would rather forget
•intrusive enough to be present / not intrusive enough to be distractive
•to focus your mind to work / unfocus your mind to sleep
•to focus your mind on thoughts to sort out / unfocus your mind on thoughts you would rather forget
•intrusive enough to be present / not intrusive enough to be distractive