tufte-latex: \newthought after \section

Question

Using \newthought after a new section title inserts an unusual vertical space as in the following example.

\documentclass{tufte-book}
\usepackage{kantlipsum,cleveref}


\begin{document}

\section{Monday}
\kant[1]

\section{Tuesday}
\newthought{Let us suppose} that the noumena have nothing to do with necessity,
since knowledge of the Categories is a posteriori. 
\kant[3]

\end{document}

1. Is there an (preferably automatic) way to correct this?
2. Should \newthought be avoided after a section title maybe due to typographic reasons? If the answer is yes I would appreciate an explanation why.

Answer 1

The definition of \tuftebreak can be improved:

\documentclass{tufte-book}
\usepackage{kantlipsum,cleveref}

\makeatletter
\def\tuftebreak{%
  \if@nobreak\else
    \par
    \ifdim\lastskip<\tufteskipamount
      \removelastskip \penalty -100
      \tufteskip
    \fi
  \fi
}
\makeatother

\begin{document}

\section{Monday}
\kant[1]

\section{Tuesday}
\newthought{Let us suppose} that the noumena have nothing to do with necessity,
since knowledge of the Categories is a posteriori.
\kant[3]

\end{document}