diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d39431..22ab930 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## v9?
 
 - We have moved the root check to the beginning of the script, and improved DEBUG handling with two different modes. `DEBUG=0` is still for production, and `1` is still for the DEBUG we previously knew downloading to the directory it is running from, but `2` will download to temporary folder, will detect updates, but will not install anything, but it will notify the user (almost as running the script without root before).
+- Added option to not interrupt Do Not Disturb full screen apps like Keynote or Zoom with `INTERRUPT_DND="no"`. Default is `"yes"` which is how it has worked until now.
 - `pkgName` in a label can now be searched for. An example is logitechoptions, where only the name of the pkg is given, and not the exact file path to it.
 - `LSMinimumSystemVersion` will now be honered, if the `Info.plist` in the app is specifying this. That means that an app that has this parameter in that file and it shows that the app requires a newer version of the OS than is currently installed, then we will not install it.
 - New variable `RETURN_LABEL_NAME`. If given the value `1`, like `RETURN_LABEL_NAME=1` then Installomator only returns the name of the label. It makes for a better user friendly message for displaying in DEPNotify if that is integrated.
@@ -20,6 +21,7 @@ Big changes to logging:
 - A function to shorten duplicate lines in installation logs or output of longer commands
 - Ability to extract install.log in the time when Installomator was running, if further investigations needs to be done to logs
 
+
 ## v8.0
 
 - removed leading `0` from the version because it has lost all meaning (thanks to @grahampugh for the inspiration)
diff --git a/fragments/functions.sh b/fragments/functions.sh
index 8b703f7..647ef85 100644
--- a/fragments/functions.sh
+++ b/fragments/functions.sh
@@ -820,4 +820,30 @@ finishing() {
     fi
 }
 
+# Detect if there is an app actively making a display sleep assertion, e.g.
+# KeyNote, PowerPoint, Zoom, or Webex.
+# See: https://developer.apple.com/documentation/iokit/iopmlib_h/iopmassertiontypes
+hasDisplaySleepAssertion() {
+    # Get the names of all apps with active display sleep assertions
+    local apps="$(/usr/bin/pmset -g assertions | /usr/bin/awk '/NoDisplaySleepAssertion | PreventUserIdleDisplaySleep/ && match($0,/\(.+\)/) && ! /coreaudiod/ {gsub(/^.*\(/,"",$0); gsub(/\).*$/,"",$0); print};')"
+
+    if [[ ! "${apps}" ]]; then
+        # No display sleep assertions detected
+        return 1
+    fi
+
+    # Create an array of apps that need to be ignored
+    local ignore_array=("${(@s/,/)IGNORE_DND_APPS}")
+
+    for app in ${(f)apps}; do
+        if (( ! ${ignore_array[(Ie)${app}]} )); then
+            # Relevant app with display sleep assertion detected
+            printlog "Display sleep assertion detected by ${app}."
+            return 0
+        fi
+    done
+
+    # No relevant display sleep assertion detected
+    return 1
+}
 
diff --git a/fragments/header.sh b/fragments/header.sh
index 9dbb81e..25dfaf4 100644
--- a/fragments/header.sh
+++ b/fragments/header.sh
@@ -126,6 +126,18 @@ REOPEN="yes"
 #            instead of just the label name.
 
 
+# Interrupt Do Not Disturb (DND) full screen apps
+INTERRUPT_DND="yes"
+# options:
+#  - yes           Script will run without checking for DND full screen apps.
+#  - no            Script will exit when an active DND full screen app is detected.
+
+# Comma separated list of app names to ignore when evaluating DND
+IGNORE_DND_APPS=""
+# example that will ignore browsers when evaluating DND:
+# IGNORE_DND_APPS="firefox,Google Chrome,Safari,Microsoft Edge,Opera,Amphetamine,caffeinate"
+
+
 # NOTE: How labels work
 
 # Each workflow label needs to be listed in the case statement below.
diff --git a/fragments/main.sh b/fragments/main.sh
index 557b35b..f77335f 100644
--- a/fragments/main.sh
+++ b/fragments/main.sh
@@ -15,6 +15,13 @@ fi
 
 # MARK: application download and installation starts here
 
+if [[ ${INTERRUPT_DND} = "no" ]]; then
+    # Check if a fullscreen app is active
+    if hasDisplaySleepAssertion; then
+        cleanupAndExit 1 "active display sleep assertion detected, aborting"
+    fi
+fi
+
 printlog "BLOCKING_PROCESS_ACTION=${BLOCKING_PROCESS_ACTION}"
 printlog "NOTIFY=${NOTIFY}"