some scheduling headroom ratings

README.md

@@ -52,7 +52,6 @@ Anything we link to that isn't there yet:
 - dualcore
 - tricore
 - quadcore
-- gap
 - falling-asleep
 - non-reducing
 - adapted

schedule/M1.html

@@ -46,6 +46,17 @@ one stuck in [[!stage-2]]. [[!DualCore]] schedules, especially
 <b>In people with [[!RSR]]</b>, M1 often turns into [[+M0-Shortened]]
 or [[+MX-Shortened]].
 
+<h2> Scheduling headroom </h2>
+
+<i> Scheduling headroom does not refer to [[!flexing]]. Once chosen,
+[[!Consistency]] within the schedule remains a requirement. All
+schedules can be rotated arbitrarily with sufficient [[!dark-period]]
+and light period. </i>
+
+The nap can be moved around by at least 2h in scheduling without causing
+too much sleep [[!pressure]] buildup. Once chosen, sticking to the time
+remains important.
+
 <h2> Adaptation </h2>
 
 [[!Adaptation]] to M1 from [[+Mono]] is best done cold turkey - just

schedule/M2.html

@@ -35,3 +35,23 @@ for [[!zombie-mode]]. [[+M3e]] is recommended for a more accessible
 <p>
 For people with [[!RSR]], M2 is likely quite easy, though may still involve
 some difficult moments.
+
+<h2> Scheduling headroom </h2>
+
+<i> Scheduling headroom does not refer to [[!flexing]]. Once chosen,
+[[!Consistency]] within the schedule remains a requirement. All
+schedules can be rotated arbitrarily with sufficient [[!dark-period]]
+and light period. </i>
+
+The first nap needs to be during the [[!REM]] [[!peak]], so it can only be
+moved around within that. Adjusting [[!DP]] will move the peak somewhat, but
+only to a degree. This equates to a headroom of about -2.5h and +1h. At the
+edges of this, the nap becomes more difficult or less efficient, so it's best
+to stay within -2h and +30mins. Once chosen, sticking to the time remains
+important.
+
+The second nap is mainly constrained by [[!gap]] lengths and by the end of
+the afternoon. It should be no later than 16:30 (in default rotation) to
+avoid risking [[!SWS]] creep. The distance to the first nap should be at
+least 5h but no longer than 8h. Ideally, it should stay around 6h. Once chosen,
+sticking to the time remains important.