I don't know if it needs a hook but I can't make a bed which you can sleep in it without modifying a base class.

At the end of Block.class you'll see forge already added things to make beds work.

Your new bed block will need to override them.

 

    /**
     * Determines if this block is classified as a Bed, Allowing 
     * players to sleep in it, though the block has to specifically 
     * perform the sleeping functionality in it's activated event.
     * 
     * @param world The current world
     * @param x X Position
     * @param y Y Position
     * @param z Z Position
     * @param player The player or camera entity, null in some cases.
     * @return True to treat this as a bed
     */
    public boolean isBed(World world, int x, int y, int z, EntityLiving player)
    {
        return blockID == Block.bed.blockID;
    }
    
    /**
     * Returns the position that the player is moved to upon 
     * waking up, or respawning at the bed.
     * 
     * @param world The current world
     * @param x X Position
     * @param y Y Position
     * @param z Z Position
     * @param player The player or camera entity, null in some cases.
     * @return The spawn position
     */
    public ChunkCoordinates getBedSpawnPosition(World world, int x, int y, int z, EntityPlayer player)
    {
        return BlockBed.getNearestEmptyChunkCoordinates(world, x, y, z, 0);
    }

    /**
     * Called when a user either starts or stops sleeping in the bed.
     *  
     * @param world The current world
     * @param x X Position
     * @param y Y Position
     * @param z Z Position
     * @param player The player or camera entity, null in some cases.
     * @param occupied True if we are occupying the bed, or false if they are stopping use of the bed
     */
    public void setBedOccupied(World world, int x, int y, int z, EntityPlayer player, boolean occupied)
    {
        BlockBed.setBedOccupied(world,  x, y, z, occupied);        
    }

    /**
     * Returns the direction of the block. Same values that 
     * are returned by BlockDirectional
     * 
     * @param world The current world
     * @param x X Position
     * @param y Y Position
     * @param z Z Position
     * @return Bed direction
     */
    public int getBedDirection(IBlockAccess world, int x, int y, int z) 
    {
        return BlockBed.getDirection(world.getBlockMetadata(x,  y, z));
    }
    
    /**
     * Determines if the current block is the foot half of the bed.
     * 
     * @param world The current world
     * @param x X Position
     * @param y Y Position
     * @param z Z Position
     * @return True if the current block is the foot side of a bed.
     */
    public boolean isBedFoot(IBlockAccess world, int x, int y, int z)
    {
        return BlockBed.isBlockHeadOfBed(world.getBlockMetadata(x,  y, z));
    }