And that got me thinking. What if our brain does this with our memory when we go to sleep. Our conciseness dies, but brain carefully prepares memories in a way that in the morning the new consciousness doesn't notice and consider itself to be the same as yesterday.
For example, if you were using MySpace or LiveJournal, or early Twitter, you could see your entire history, and in some cases do query and search like "between 2 and 3 years ago" or "everything with X tag".
However, with today's services, it is becoming increasingly difficult to do that kind of querying outside of the, if you're lucky, 3 different sorts of hot/top/new. Some places will also limit the number of items you can see.