Spiritual Immortality

Heaven & Hell

Even though Heaven would be considered one of the best forms of afterlife, it might be possible that it inhabitants might become tired of it, or they may be eternally happy and just not care. In Hell, people would be in too much agony to even think about anything other than the hideous screaming pain. Either way, it is possible that a person may not like living forever, even spiritually.

Wraith: The Oblivion

The the roleplaying game Wraith: The Oblivion, published by White Wolf Publishing, Inc., the aftelife is place known as the Underworld, where people who die enter as ghosts. Many are unhappy with their eternal existences and either become insane Spectres or ossify into statues. Originally, the Underworld was a place where the dead stayed until they reached transcedence, but the notion was later considered heretical.

Rejuvenation

In fiction, there is an increasing amount of work being done on possibilities of rejuvenation treatments, and the effect this would have on society. Misspent Youth as well as the commonwealth saga by Peter F Hamilton are one of the most well known examples of this, dealing with the short and long term effects of a near perfect 80 yr old to 20 yr old body change with mind intact. Also the Mars trilogy deals with a much more inperfect type of rejuvenation, including problems such as long term memory loss and sheer boredom that comes with such age. Also the post mortal characters in the Revelation Space series often illustrate this issue with long term or essentially infinite lifespans, sheer boredom unduces them to undertake activities of extreme risk.