This doesn't actually have anything to do with the noise a parrot itself makes, but about how they feel about noises not made by them. I noticed that our IRN Simo seems to be fidgety and restless when the house is silent. Even if we are awake. I experimented and observed him while for example, having headphones on in the day time and playing / watching stuff, reading, just doing low activity things without sounds and then compared to how he is when there is noise in the house (music, game sounds, talking, vaccuuming, hair dryer).
The results were as one with logic sense might expect: Restless, fidgety, climbing all over his cage, doesn't play while it's silent. When there's noise, he exhibits positive body language and seems chipper and comfortable. I'm guessing this is all very normal and logic because in their natural environment, silence is rare and occurs seldom like that. It seems to be the same when he sleeps: I put on some gentle rain sounds for him (and myself and the husband!). If the house is silent in the night, I can hear him stirring in the cage albeit it's covered - but with the sounds on, once again he seems relaxed and calm (albeit the rain sounds are on I'd still be able to hear him if he did stir).
I'm just simply wondering if I'm correct with this: that parrots just naturally like a bit of noise around them day and night. Do other people put on some gentle sounds for the night, like rain or some such? Or is this something negative and looked down on? (in addition he seems to prefer certain types of music to others but that's a different, although fun, topic!
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Indeed! Little everyday living noises make him very comfortable; but the same actually goes for me. The only types of noises we avoid are video games & movies at night if we're awake - but instead I set some rain / jungle sounds. Silence does indeed signal that something is wrong like that. While this in itself is a bad example it does extend to us humans at times too: for example, it's an entertainment industry element as well. How many times have we heard the main character in a book or a movie say "It's quiet. Too quiet." And it always signals some form of doom and gloom. 
On the very few occasions that we do exit the house we never ever leave it silent, and put on some nice jazz or rain sounds. Even when we will get his buddy, we'll probably continue to put on some rain sounds and what not, to keep the house sounding "alive". 
