Vain and condescending, Insomnia treats her pitiful like they are pets, more than anything. She is strong willed and cold, coming across as aloof and snobby to most people she meets. Around Elayna, however, she is motherly and twitchy, and the difference in behaviour is clearly visible. 

Insomnia stands 7ft tall, and is more slight of frame than Dementia. Her horns shimmer under light, as do her hands, feet, ear tips and forehead.

She tends to not wear a whole lot of clothing, as she quite likes being cold (and Hell isn't exactly the chilliest place). Her usual attire is mostly metal, with fabric lacing and decorated with sapphires. She can also be seen in light, flowing dresses of whites and blues. She never wears long pants

To be written later...