Tessa was lying helplessly on her bed, she couldn't sleep properly, how could she sleep when Klaus's life was in danger, tomorrow she might not see Mr. Walker again, and she brought him into this mess.
Tessa removed all the clocks in her room, and she switched off her phone so she wouldn't be able to keep track of time, she didn't want anything to push her to go save Klaus.
She believes in her father's words, that Head Commander Grayson might also be targeting the Wood family; going to save Klaus was not an option for her because she would be putting the entire Wood family at risk.
This was one of the downsides of being an important figure in a family or a group, everything one does always matters and always affects everyone, whether positive or negative.
Tessa continued to stare at the ceiling, it was dark already and she wondered if it had passed 11pm. Klaus once said she should trust him, but she wonders if it applies to this situation.