In function g.sib.det we consider the first night if it starts after midnight and before 4am and refer to this as night 0.
However, this goes wrong when there is only one midnight in the recording. In that case countmidn is 1 and
it sets firstmidnighti to 1, by which the first4am < firstmidnighti later on in the function returns FALSE.
To fix this we need to set firstmidnighti = midnightsi[1].
In function
g.sib.detwe consider the first night if it starts after midnight and before 4am and refer to this as night 0. However, this goes wrong when there is only one midnight in the recording. In that casecountmidnis 1 and it setsfirstmidnightito 1, by which thefirst4am < firstmidnightilater on in the function returns FALSE.To fix this we need to set
firstmidnighti = midnightsi[1].