is it possible?....

just a bit of heads up a persons personality normally does change from year to year, day to day, month to month. on a normal standard a persons personality is made up of how they feel, what they do and their past experiences. for example a person may have just lost a relative so when someone last sees them their normal way they are is sad/grieving. during the time between that and the next time these people meet their grieving has past and they have had some new experiences happening so when the two people meet again to one person the other is going to seem different just because mentally and physically they are not grieving/sad any more. thats just one example of how people change their personality on a normal level every second/minute/hour/ day/ month/year....that why there is no diagnostic criteria for dissociative disorders stating the person must seem different to other people. seeming different to other people is just a fact of life and how humans normally are.

also near death experiences are physical not mental so are not considered part of dissociative disorders here in the USA. Im guessing this friend of yours was talking about something other than a dissociative disorder.

checking out and letting the alters take control...hate to be the bearer of bad news but switching into an alter isnt a choice for people with DID. its a reaction to being traumatically triggered by something. Then the alter in which handles that extreme trigger handles the problem..example if a person with DID is traumatically triggered by sex (high anxiety, panic attack, fear for their life type reaction to having sex) they will automatically switch into an alter or on other words dissociate to such an extreme that an alter takes over) and then the alter performs the sex. switching into alters is not something that is planned and done on a whim for people with DID. it just happens. if its not happening for you then that means you are ok, not triggered and able to handle what ever it is that you want to plan letting alters do. basically all that will happen when you try this letting go so an alter will take over is you wll be relaxed, calm, but still in complete control and aware. some people call this state of mind meditation when this happens.

can alters be in different condition than each other and the host yes in fact thats one of the diagnostics...having alters that are a special kind of alter. the diagnostics call it distinct.