Sick leave in a dream is read as a need to stop and recover, often from strain rather than illness. Tradition sees it as permission to rest that you may not be giving yourself while awake.
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.