Lying still in the narrow tunnel of a scanner is read as being examined closely while unable to move. Dream books connect it with waiting for an answer while worry clatters all around a quiet centre.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.