We should have taped the whole process of getting the mattress upstairs and into the bedroom. Then the hilarious part of removing the wrap around the mattress. As soon as we started to open the plastic the mattress started to expand and my husband was trying to rip off the wrap as fast as possible. The mattress expands quickly! There really wasn't much of an odor but just to be on the safe side we turned on the air purifier and closed the bedroom door for the night. We slept downstairs. The next day I couldn't detect any odor and I have all kinds of migraine triggers, no problems what so ever. Slept on the new mattress the night after we received it. Husband and I both slept really well. I would say that it took us less that a week to completely adjust to the memory foam mattress as opposed to our old traditional mattress. I had a tendency to sleep really close to the edge of the mattress and I don't do that any more as the mattress really gives if you are next to the edge. It's hard to explain because the mattress overall has a LOT MORE SUPPORT than a traditional mattress; just don't expect that firmness at the edges. I have a lot of hip pain when I lie down. I won't say that this new mattress has allowed me to sleep pain free but I do sleep better and feel much better when I get up. My husband is really liking the new mattress and he really did not want a memory foam mattress! Here are a couple more items of interest if you have never slept on memory foam. It does sleep warmer but not hot! We got our new mattress in the middle of the summer and have no complaints. We live in Maine (yes, it does get hot here) and the winters are COLD so we used a mattress warmer on the traditional mattress. You can't use one with this type of mattress. As far as I can tell the memory foam seems to take any heat from your body and send it back to your body to keep you warm. Yet it doesn't make you hot. Regular mattress pads are not recommended as far as the "experts" say. There was an article that I read about some guy doing a study to find the best mattress pad to use with memory foam mattresses and he came up with two brands. One is next to impossible to find. The other is carried by quite a few places but you have to shop around for the best price. The mattress pad is called Protect a Bed and you would not know you were sleeping on anything extra. It is made so that it does not mess with the features of a memory foam mattress. I did a lot of research on memory foam mattresses. It took me several days and a lot of reading to decide this was the right mattress for us. This is an awesome value.