shake

Hello, I've had my cockatiel, Chancy, for 2 months now and she's very cute and seems to be settling into her new home well. However... She seems to be shaking and shivering a lot recently. It's particularly noticeable in her tail feather. At first, I thought this down to the cold weather so...

My cockatiel max is shaking and his eye is twitching... I think he might be sleep deprived tho as my parents were up at 12 in the room the birds sleep in... I am very worried... Please reply as soon as possible