diff --git a/sleepyhead/SleepLib/day.cpp b/sleepyhead/SleepLib/day.cpp
index 9ab58b98..3a3b4361 100644
--- a/sleepyhead/SleepLib/day.cpp
+++ b/sleepyhead/SleepLib/day.cpp
@@ -136,7 +136,7 @@ EventDataType Day::calcMiddle(ChannelID code)
 }
 EventDataType Day::calcMax(ChannelID code)
 {
-    return p_profile->general->prefCalcMax() ? percentile(code, 0.99f) : Max(code);
+    return p_profile->general->prefCalcMax() ? percentile(code, 0.995f) : Max(code);
 }
 EventDataType Day::calcPercentile(ChannelID code)
 {
diff --git a/sleepyhead/daily.cpp b/sleepyhead/daily.cpp
index b921d21d..7c2913fd 100644
--- a/sleepyhead/daily.cpp
+++ b/sleepyhead/daily.cpp
@@ -1173,7 +1173,7 @@ QString Daily::getStatisticsInfo(Day * day)
     float percentile=p_profile->general->prefCalcPercentile()/100.0;
 
     SummaryType ST_max=p_profile->general->prefCalcMax() ? ST_PERC : ST_MAX;
-    const EventDataType maxperc=0.99F;
+    const EventDataType maxperc=0.995F;
 
     QString midname;
     if (ST_mid==ST_WAVG) midname=STR_TR_WAvg;
diff --git a/sleepyhead/overview.cpp b/sleepyhead/overview.cpp
index a7074e2e..e336cc3b 100644
--- a/sleepyhead/overview.cpp
+++ b/sleepyhead/overview.cpp
@@ -137,7 +137,7 @@ Overview::Overview(QWidget *parent, gGraphView *shared) :
     if (mididx == 2) { ST_mid = ST_AVG; }
 
     SummaryType ST_max = p_profile->general->prefCalcMax() ? ST_PERC : ST_MAX;
-    const EventDataType maxperc = 0.99F;
+    const EventDataType maxperc = 0.995F;
 
     US = createGraph(STR_GRAPH_SessionTimes, tr("Session Times"), tr("Session Times\n(hours)"), YT_Time);
     SET = createGraph("Settings", STR_TR_Settings, STR_TR_Settings);