Most issues can be fixed by clearing your browser’s cache. You can find instructions on how to do so in your specific browser here.
Check your spam or junk folder. Sometimes emails from the Consensus Sleep Diary can be sent to spam.
This can happen if you complete an entry in the early hours of the morning. DOZe turns to a new day at 3:00am every morning, so your entry for the previous day should be completed before then.
This can happen if you have bookmarked the first question in the diary and use that bookmark to complete your diary each day. If you’re using a bookmark to get to DOZe, make sure that bookmark is for the dashboard and not the diary itself.