I've programmed something similar where you can have nested bookmarks, set them private or not, add keywords, etc. But the killer feature is that you can specify how often you want to visit a link (e.g. every 30 days or once a day) and prioritize this list of links which are due to be visited. This is accomplished by giving each link an "Ascent Speed" value, which determines how quick the link will travel to the top of the list. So each link has an "urgency value" which you get by multiplying "how long is this link due to be visited" and "how important is this link to me". This system works quite well if you have hundreds of bookmarks like me. It makes sure you never miss a link and you visit them in a prioritized way. See http://www.bookmark-manager.com/
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I've programmed something similar where you can have nested bookmarks, set them private or not, add keywords, etc. But the killer feature is that you can specify how often you want to visit a link (e.g. every 30 days or once a day) and prioritize this list of links which are due to be visited. This is accomplished by giving each link an "Ascent Speed" value, which determines how quick the link will travel to the top of the list. So each link has an "urgency value" which you get by multiplying "how long is this link due to be visited" and "how important is this link to me". This system works quite well if you have hundreds of bookmarks like me. It makes sure you never miss a link and you visit them in a prioritized way. See http://www.bookmark-manager.com/
Instead of Melatonin maybe try Sominex. In my pharmacy they recommended me this instead of Melatonin. Apparently its milder but has the same effect.
I use Bluesmiley Bookmark Manager, see Bookmark Manager, supports Import and Export of Bookmarks.