ET,
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Dally loves sleeping in general. He's not lazy, per se, but he does treasure his sleep. He'll really sleep anywhere in any position in anything. However, he won't sleep unless he is 100% everyone else around him is safe and comfortable, even if he isn't.
Javalasii is a little different. She's more guarded with her sleep, and doesn't particularly like to sleep in loud places or bright places. When she does go to sleep, her main priority is Dally's well being, and then being tucked into the tightest ball she could possibly contort her body into.
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Dally has nightmares. Every single night. Usually the same one over and over.
As far as Dally has observed, Java seems to have dreams, due to the fact that she twitches in her sleep, but what he's heard from her is that she doesn't, so she may or may not.
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Dally can be either. It really just depends what will help him be around more company, whether they want him there or not. Most of the time it's both, due to the fact that he's rushing around and trying to get all of the insomniacs to sleep.
Java has a fairly decent schedule, unless some antics ruin it. However, her internal clock is still set to that of her home planet, so her night could be different from everyone else's depending on where they are. What is known is that she tends to be very groggy after just waking up.
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Dally can crash immediately. As said, anywhere, anytime, as long as the people around him are okay.
Java has a bit of a hard time falling asleep, but not enough to count as insomnia. This is typically because she is on a bed or a wood floor instead of buried in a cold mud puddle.
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Dally? Absolutely. And he won't just sleep around other people - he will sleep on top of them. However clingy you think he is, multiply that by 10.
Java? Not really, but she'd do it for Dally. And she trusts the crew, for the most part.
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Java lays down, Dally flops on top of her. Or, Java lays down and watches as Dally flops on top of someone else.
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Dally cannot function without sleep, which makes him even worse. He's exhausted, but his anxiety won't let him sleep while he thinks it's day, and his anxiety also won't let him sleep if too many other people are awake. So he sits there with a cup of coffee in his hand, looking like he got slapped with several toads.
Java, on the other hand, can go several months without any sleep and function perfectly. But once she gets past a certain line, she'll simply.. collapse. This has been learned.