Does wifi sleep when iPad sleeps?

My iPad2 (wifi only) has been asleep, disconnected from power for several hours. I used my iPhone to locate the iPad w/"find iPhone". It successfully located the iPad within 10 seconds. this sugests that wifi is indeed active during sleep.

Forget what I said about the Fetch settings. Mea Culpa. I sent emails to a Fetched account. That is why it was using the Fetch schedule. I performed more tests and found that Craig is absolutely correct. I sent an email to a Pushed account while running countinuos pings to the iPad that was in sleep mode and not connected to power. Before the email was sent I was getting no ping responses. Just after I sent the email, the iPad began responding to the pings and the email was received. After receiving the email, the iPad quit responding to the pings.

My conclusion is that for the most part, WiFi goes to sleep when the iPad is in sleep mode while not connected to a power source. There is a part of the WiFi that watches for Pushes and wakes the main portion of WiFi to receive any Pushed data. In addition the WiFi comes awake according to the Fetch schedule to get those emails.

I have found that in certain circumstances my Wifi disconnects totally when my IPad keeps. I must go through all the steps to get it to locate the wifi again. Even with my home router that I have password set up in my IPad. Trying to find an answer to fix this. Hope I used the correct terminology

The WiFi does turn off when the iPad is placed in sleep mode, unless it is connected to a power source. To answer your question to Tamara, I have done ping tests to verify this behavior. When in sleep mode and not connected to power I get no response to pings. When connected to a power source, I get a response from my iPad to the pings.

I just performed a test on Craig's Info on Push Services. Email does come through when the iPad is in sleep mode but takes a long time to come through. I suspect that when your iPad is in sleep mode email falls back to the Fetch schedule.

Gzukes, I am not sure it needs to be connected to a power source. I get notifications all the time when my pad is asleep, and not plugged in.

I never said that you couldn't receive notifications or email when not plugged in. In fact I agree with Craig Brady that WiFi probably doesn't go to sleep completely. My tests indicate that at least for emails, WiFi does wakeup and periodically check for Pushed emails. I further suspect that the frequency it checks for Pushed emails may be tied to the Fetch frequency in Settings. I plan to set it to Manual tonight and see if I get any emails overnight with the power off.