I've had my rats for a month now, they're about 3-4 months old. They have a relatively large cage for just two of them, 2 different floors with toys and a wheel. For the first two weeks, they hid in a little box with an old tshirt of mine for them to sleep in. They barely ever came out of it, maybe coming out for about 20 minutes a day to hide in the corner of the top floor or to drink. I realised they also NEVER used the toys so I removed them from the cage. In the third week, they started to use the wheel more often, but they'd never explore on the first floor (which has their paper bedding in it), only on the second, where they'd mostly hide under the wheel or in the corner. In the fourth week, I started bringing their box with them in it out of the cage and onto my bed, when they were already awake, so they could run around and maybe climb on me. On the second and third day they started to climb on me and run over to say hello, but then on the fourth they resorted back to just hiding in their box when I got them out. I attempted to pick them up a few times, making sure to support their feet, but they'd always just run along my arm to escape, not once have they stayed. I speak softly to them, and have done since I got them so they'd get to know my voice. They occasionally peak their heads out of the box when I say hello, but that's all. If I turn around in my chair (their cage is behind me) they'll stop what they're doing and hide away so I can't see them. They NEVER come out to see me and sometimes don't even accept treats from me, they just run away into their corner or the box. The only times they come out is for about 10/20 minutes in a morning and when I'm in bed. I get they're nocturnal, but they're definitely awake at different parts of the day, they just hide. It's beginning to really annoy me, because I clean their cage, give them food, give them treats, bought them the wheel, and I get nothing back. They just run away from me. The only form of affection I get is them sniffing my hand or looking for food on it.