Imagine living in a world where time does not exist, that is the case for Clive Wearing, a man who due to viral encephalitis has a ~30 second memory.
Every second is a shock to him, he feels he has never been awake before, never seen another human, never eaten, never slept, he is a man truly out of touch with reality.
Check out the documentary below, it is a fascinating watch;
Clive wearing, the man with the 30 second memoryIf this interests you, you may also want to look at Henry Molaison (H.M) who was left with severe retrograde amnesia due to a surgical procedure which destroyed his hippocampus.