Caitlyn Jenner poses in a black dress.

Caitlyn Jenner stays awake all night thinking about transgender issues in I Am Cait clip.

In a sneak preview from the Sunday, 2 August, premiere episode of I Am Cait, E!'s new eight-episode docu-series, Jenner admits she's having trouble sleeping. What's keeping her up at 04:32? As the 65-year-old explains in the video, she wants to be a good role model and do her part to help the transgender community.

Wearing no make-up and filming herself in bed, Jenner confesses, "I feel bad that these [people] - especially young people - are going through such a difficult time in their life. We don't want people dying over this. We don't want people murdered over this stuff. What a responsibility I have towards this community. Am I going to do everything right? Am I going to say the right things? Do I project the right image? My mind's just spinning with thoughts. I just hope I get it right. I hope I get it right."

Jenner needn't have worried.

After announcing to the world that she is transgender, she had the opportunity to speak with many members of the transgender community who have thanked her for being an inspiration. As Jenner said in Vanity Fair's July issue, "Since the Diane Sawyer piece, every's exciting to go to the mailbox...I get letters every day from all of these people from all over the world. I've gotten a lot from trans women, and telling their story and telling how excited they were to see the Diane piece."

Jenner recalled how she received a letter from a transgender woman in New York. "She had so many interesting things to say, but at the end she left her telephone number, so I called her," she said. "I think she was very surprised I called."

The phone conversation lasted "close to 45 minutes". Jenner said she decided to call the woman for another reason. "I have a platform that's so large. 'How can I use that to make this better?' And the only way I could do that is to talk to people."

I Am Cait premieres on Sunday, 2 August at 20:00 CAT, only on E!