You go back to where it lists all the trackers the site has to offer. Under sleep tracker it will list that you already have one and there should be a little trash can beside of it. You just click it and say yes you would like to delete it.
khendrick is correct in how you delete a tracker. From your sleep tracker, look for the Trackers button in the upper right. If you click on that, you'll see the page where you can add or delete trackers. click the trash can icon next to the sleep tracker and it will be removed from your profile. But all of your data will be lost as well and we will not be able to retrieve it again if you decide you want to use the tracker again.
You can choose to not display your ticker on your tracker page and/or on your profile page. Go to the related tracker page. Under the ticker, you'll see a link that says "Embed and Configure Ticker". You can change your settings there.
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