Lock screen goes back to sleep too quickly.

Hi there, I have been grumbling to myself and my wife for a long time about this and now I'm coming here to ask questions! When ever I receive a notification, email or text, my phone wakes up and either begins to read the subject or I scroll through the lock screen to find the info. But, it usually goes back to sleep too quickly for me to hear the subject of the email, or the content of the text! Is there any way to adjust this? I have had some success by facing the screen toward my face and moving the phone gently thinking that maybe it will stay awake if it knows I'm paying attention. It works sometimes.

Similarly, I have an app on my phone which displays affirmations on the lock screen, but it only displays a portion of the text of the affirmation. Is there any way to increase the amount of info an app displays on the lock screen?

Thanks so much for any info you can provide!

Rusty