Pollynap types.

From the Wayward Wellingtonians:

Since we started sleeping polyphasically, I've noticed the quality and nature of naps varies quite a bit. Most naps are just "standard" naps, but I get at least one of these naps each week or so:

8. The Paradox (AKA The Traitor, The Pan Galactic Gargle Nap)
Everything seemed to go so well. You lay down on schedule, fell asleep right away, and had a lovely dream involving cake, meadows and fluffy animals. Yet you wake up feeling like someone stuffed your head full of polystyrene and poured bleach in your eyes.

Luckily, the effect tends to fade away after a few minutes.

7. The Time Warp (AKA The Forgotten Oversleep, The WTF Nap)
Three hours have passed, both alarm clocks have been switched off, along with the light and the MP3 player. You may also have had a drink and been to the bathroom at some point. The last thing you remember is lying down.

6. The Newbie Nap (AKA Murphy's Nap, The Coffee Victim)
Your eyes refuse to stay open. Your body is exhausted. Your brain feels like it's been stuffed with cotton wool. You lie down expecting the best nap of your life.

Instead, you spend 20 minutes thinking about how badly you want to get to sleep. The ticking clock, humming refrigerator, faint noises from next door and blinking LED on the VCR also don't help.

5. The Phantom Nap (AKA The Non-Nap, The Wake)
You were awake when you lay down. You were awake when the alarm went off. You don't remember waking up. Did you sleep in between? No-one will ever know. Unless someone heard you snoring.

4. The Nap-22 (AKA The No-Win-Nap, The Nap-And-A-Half-Without-The-Nap)
You wake up feeling pretty good. Eyes open, head clear. But there's a problem. You still have half your time left. Do you get up, or go back to sleep?

If you get up you'll feel tired later. If you go back to sleep you'll feel tired when you wake up. You may as well just give up and sleep through to the next nap (not really).

3. The Micronap (AKA The Surprise, The iNap Nano)
Why did the hand of that clock jump forward two minutes?

2. The Snap (AKA The Epiphany, The Crystal Pillow)
You suddenly snap awake, with one minute left on the clock. You feel like your whole life has been a lead-up to this one moment of startling and unexpected clarity.

Work fast. You have about 5 minutes before you go back to normal.

1. The Chrono-Nap (AKA The Bullet-Time, The Saga)
You fall asleep almost immediately and have an incredibly long and detailed dream. You wake up what feels like hours later, cursing yourself for oversleeping, only to realize you've been asleep five minutes.

You resist the urge to call your monophasic friends and tell them how awesome polynapping is.

I'd like to add a ninth:
9. The Zonk (AKA The Negative Time Share)
You feel pretty tired and fall asleep quickly. When you awake, you feel just like you did when you laid down, pretty tired. No dreams, no rest.. ARgh.. should have stayed up and played Halo2.