It's impossible to know that you've had a precognitive dream until the events in the dream actually unfold sometime later in real life.

When they do, you realize that you've had a premonition dream - and naturally you want to tell people about it.

Unfortunately, the people you tell may not in believe in psychic phenomena like precognitive dreaming - and may either scoff or think you're imagining things.

Here's a "timestamped" way you can prove that you had the dream in advance of the events:

Start your own online dream blog, recording as many of your dreams as you can (since you never know which ones may turn out to be premonitions).

The blog automatically timestamps all entries, so you can prove the date you actually had the dream if it later comes true.

Alternatively, if you have a really significant-feeling dream - such as a vision of a plane crash or natural disaster - you can record it at Harry Bosma's online Dream Registry.

There has been a long-standing debate as to whether humans dream in color, or in black and white. Read more

Premonition dreams are also called precognitive dreams or futuristic dreams.

They may be symbolic and difficult to interpret, or they may play out like a movie of the impending event. Read more

Recurring dreams usually contain messages from the subconscious that we don't understand or keep ignoring. Read more

Sleep paralysis is a temporary state of complete inability to move or speak, occurring just before dropping off to sleep or just before fully awakening from sleep. Read more

Unique as we all are, there are a surprising number of common dream images experienced by a large percentage of people. Read more

Night terrors are caused by intense brain activity during deep Stage 4 sleep.

In contrast, nightmares are a type of dream and occur during the REM sleep stage. Read more

REM sleep (the periods of rapid eye movement during normal sleep) occurs in all species of mammals. Read more

Lucid dreaming is being aware that you're dreaming.

Sometimes the lucidity is triggered by a bizarre or impossible event in the dream that causes you to understand that it isn't reality. Read more